Merchant Level 50: Three items. If you are defeated in a dungeon, you may bring three items back instead of two.

Bonus characters

Successfully complete the indicated task to unlock the corresponding character:

Arma: Unlock all other characters. Arma will visit you in the morning. Successfully complete the Lapis Ruins in Endless mode, and she will give you her card.

Caillou: Reach Merchant Level 7. Caillou will place an order. Complete the order, then sell him items until he gives you his card.

Charme: Defeat her in Jade Way, and sell at least two items to her. She will then enter the shop during an event.

Elan: Unlock Charme, then do the pub event at night, then the merchants guild morning event. Finally, sell two items to him.

Griff: Successfully complete the Obsidian Tower in Endless mode. Griff will then visit during two evenings and will give you his card.

Louie: He will be unlocked the first time you go to the adventurers guild.

Nagi: Randomly appears in dungeons after Day 9. Meet her four times in the dungeons, then wait for her to visit the shop, and sell items to her a few times.

Tielle: Do Tielle's events in the morning or afternoon in the Town Square. Successfully complete Jade Road and Amber Garden, then sell an item to her.

Bonus dungeons

Successfully complete the indicated task to unlock the corresponding dungeon:

Amber Garden: Unlock Charme. View the event in the town square of Tielle chasing after her sister. Charme will then enter your store and mention a new dungeon.

Crystal Nightmare: Successfully complete Lapis Ruins.

Jade Way: Successfully complete Hall Of Trials.

Lapis Ruins: Pay off the debt and unlock every character except Arma. Arma will enter your store and unlock this dungeon.

Obsidian Tower: Defeat Tielle in Amber Garden, then watch both night events in the town square with Griff. Have your store towards a dark atmosphere to get Griff to come in during one of the two last slices of time. The next day Louie will enter your store and mention the new dungeon.

Haggling with customers

If a customer offers you an item, you can offer a low price. If the customer says that it is too cheap, but he or she does not leave the store, you can state the same price again and get the item at a very high price.

Haggling with Prime

Prime, Alouette's fairy, is particularly sneaky. You can offer her a reasonable price for an item, and she will reject it, claiming that you are charging her too much. However, most of the time she is lying. Prime will tell you that you are charging too much when she actually just wants to pay less. You can offer her the same price repeatedly, and usually she will eventually accept it. Note: This does not always work. Try selling her items at 114% of the original price until she accepts.